|
 |
 |
 |
 |
 |
 |
 |
| Information | |||
AMTS07 Mold Construction 7-207.20 In cases where the mold has mechanisms that will sustain substantial side loads during use, the mold will be fitted with die locks. The die locks will be of sufficient size to withstand the maximum force and placed in locations where shifting of the mold halves will be reduced. Graphite impregnated bronze wear plates will be mounted on the heel blocks. 7.21 The mold will be fitted with leader pins to provide for alignment during mold closing. The mold will contain a minimum of four leader pins. 7.21.1 The leader pins will be mounted in the four corners of the mold. One pin will be offset or of a different size to eliminate the possibility of mis-assembly of the two mold halves. 7.21.2 Leader pins are to be industry standard wherever possible. The leader pin bushings will be of graphite impregnated bronze to reduce galling and excessive wear on the leader pins. All bushing holes will be completely through the mold halves so the holes cannot fill with material or debris. The leader pins will also serve as a protector for portions of the mold that are above the parting line. Leader pins will be mounted on the same half that contains the cavity and will be longer than the highest protrusion of the mold core or standing parting line. 7.22 Lifters will be designed in such a manner to prevent any possibility or turning during production. If round pins are used to operate the lifters, there must be two pins used to guide and secure the lifter from turning. Preferred method would be a square or rectangular rods used. In either case any rod or pin that is longer than 8" will be guided by graphite impregnated bronze bushings or wear plates. Any deviation of the above methods, will have to be approved by the Argo Mold team. All lifters and components will be attached to be readily disassembled from the parting line side of the mold. If screws are used from the back of the ejector plates to attach the lifters, there must be sufficient clearance holes to attach and disassemble the lifter system without disassembling the entire mold. The following design guide lines must be followed for lifters: 7.22.1 Design must show partial view of lifters in forward position to ensure travel is adequate. 7.22.2 Does lifter side movement clear all bosses, ribs, steps in part, other mechanisms, etc.? 7.22.3 Does design show heavier wall stock(.005”/.010”) on top surface of lifter, to prevent lifter digging into part when traveling parallel to wall? 7.22.4 Is the angle of lifter pocket greater than the angle of lifter rods to prevent galling? 7.22.5 Is the diameter of lifter rods adequate? Two rods are required for large lifters. 7.22.6 If one lifter rod is used, does the design prevent the possibility of the lifter rotating in the forward position? 7.22.7 Can lifters be removed without disassembly of mold? 7.22.8 Graphite impregnated bushings must be used to guide lifter rods. 7.22.9 Large lifters require waterlines. 7.22.10 Lifters and components must be detailed. 7.23 At no time will blind holes be used for the fit of dowel pins without authorization from Argo Mold. 7.24 The mold will be fitted with standoffs, rails, or similar protective mechanisms, that allow the mold half or entire mold to be placed face down on any surface without damage to the external hydraulic cylinders, limit switches, sensing pins, or other protrusions that extend beyond the outside of the mold base surface. They are to be placed in such a manner so that the mold will not easily tip over. 7.25 Springs will be installed in the ejector plate system to assist in the return of the plate. All springs will be pocketed and have a mechanical stop so that it cannot be over-compressed. 7.26 Slides will be designed and built to the following design guide lines: 7.26.1 Are slides identified as per Argo Mold build standards? 7.26.2 Do slides use angle horn pins, or hydraulic cylinders? 7.26.3 Do slides have enough cover steel locking back of the slide to overcome injection pressure against face of the slide? NOTE: Normally the force against face of the slide would be calculated by multiplying cavity area on the slide (square inches) times the injection pressure (P.S.I.) Injection pressure normally 5,000-6,000 p.s.i., but can vary. This should be confirmed with Argo Mold. 7.26.4 Are radii large enough on locking steel in cover half to prevent cracking from injection clamp pressure? 7.26.5 Has parting line steel condition on under sides of slides been discussed to prevent galling or bad steel condition? Are load angles shown on sides of slide and underside where possible? Is the seal off angles between slides and cavity steel less than 5 degrees? 7.26.6 Are horn pins positioned on slides to prevent rocking? Is horn pin diameter large enough? Is the angle of horn pins shown? Is lock angles of slide 3 degrees (min) greater than horn pin angles? Large slides must have two horn pins. 7.26.6 Do parting line guide-pins engage before slide travel? 7.26.7 Are wrench flats shown on horn pins parallel to slide travel? 7.26.8 Is slide travel shown and dimensioned? 7.26.9 Does part clear the slide when ejected? 7.26.10 Are ejector pins or sleeves located under slides? If yes, what prevents slides from hitting ejector pins or sleeves when mold closes? 7.26.11 Are die springs and/or slide retainers shown to hold slides in open position? 7.26.12 Will springs on top slide hold weight of slides, if slide retainer breaks? 7.26.13 Are stops shown on bottom slides to prevent slide falling out of mold if slide retainer breaks? 7.26.14 Are lamina wear plates pocketed into angle face of slides? Is Graphite-impregnated wear plates shown under slides? Is Ampco material shown for GIB retainer plates? 7.26.15 Are hydraulic cylinders ordered as per Argo Mold standards? 7.26.16 Is cylinder rods’ stroke shown and dimensioned? 7.26.17 Is “T” connector shown connecting cylinder rods to slide? Do not screw cylinder rod directly to slide. Is cylinder rod keyed to “T” connector to prevent un-threading? Is steel on slides thick enough to prevent bending or breaking around “T” slot? 7.26.18 Normally the cylinder stroke should bottom out in forward position to within .030" of close position and let cover steel lock slide in position. There must be clearance in “T” slot to allow for this movement. 7.26.19 Is hydraulic manifold required? 7.26.20 Are proper hose and fittings shown? 7.26.21 Are limit switches as per Argo Mold standards? Are threaded rods and dogs shown? Are slides travel enough to activate limit switches? Do not use plastic dogs. 7.27 Normally slides are never on cover half, because they have to retract before mold opens, and there would be no steel to hold slides against injection pressure. 7.28 If slides must be on cover half, an additional mechanism is required to lock slides or hydraulic cylinders into position and be large enough to overcome injection pressure against slides. 7.29 Hydraulic cylinders must be large enough to overcome injection pressure against face of core pins(s). See formula at the end of this section. |
|||
|